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2n+3.5+2n+1.5=n
We move all terms to the left:
2n+3.5+2n+1.5-(n)=0
We add all the numbers together, and all the variables
3n+5=0
We move all terms containing n to the left, all other terms to the right
3n=-5
n=-5/3
n=-1+2/3
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